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with apical nodge

Zonneveld, K.A.F. and Pospelova V. (2015). A determination key for modern dinoflagellate cysts. Palynology 39 (3), 387- 407.

pear shaped
smooth to microreticulate wall
cyst > 45 µm
Spiniferites bentorii/Spiniferites belerius +

pear-sheped
smooth to microreticulate wall
cyst < 45 µm
Spiniferites belerius +

pear-shaped
cyst wall with hollow bubble-like elements
processes trifurcate with bubble-like elements
Spiniferites multisphaerus +

microgranulate to reticulate wall
processes trifurcate
elongate perforations at base of processes
Spiniferites lazus +

processes broad
processes with tri-branched endings
Spiniferites alaskensis +